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Interstate or Intrastate? GVWR or GCWR? The Four Definitions Every Other Rule Depends On

Updated September 2026

Almost every question in trucking compliance — do I need a USDOT number, a medical card, a CDL, a logbook — comes back to two things: what the truck weighs and what kind of commerce you are in. The definitions are in 49 CFR 390.5, and two of them are not what people assume.

Interstate commerce

The definition has three parts. Trade, traffic or transportation:

  1. between a place in a state and a place outside it — the obvious one;
  2. between two places in the same state, through another state — a route that dips across the line and back;
  3. between two places in the same state, as part of trade, traffic or transportation originating or terminating outside the state.

The third part is the one that surprises people. The truck never has to leave the state: if the shipment is on a longer journey that began or will end in another state, your leg of it is interstate commerce. A local haul from a rail yard or a port is the classic example. Most purely local junk removal does not — but "my trucks never leave the state" is not the test.

Intrastate commerce

Everything else: "any trade, traffic, or transportation in any State which is not described in the term 'interstate commerce.'" Intrastate work is governed by your state — and most states have adopted large parts of the federal rules for it, often with their own weight thresholds.

GVWR

Gross vehicle weight rating: "the value specified by the manufacturer as the maximum loaded weight of a single motor vehicle." It is on the certification label, usually on the driver's door jamb. It is a rating, not a scale reading — it does not change when the truck is empty.

GCWR

Gross combination weight rating is the greater of two things: the combination rating the manufacturer put on the power unit's certification label, if there is one — or the sum of the ratings (or actual weights) of the power unit and whatever it is towing.

So hitching a trailer changes the number. A 9,900-lb pickup is under the 10,001-lb line on its own; with a 7,000-lb-rated dump trailer it is a 16,900-lb combination, and a commercial motor vehicle if used in interstate commerce.

Rating or actual weight — whichever is greater

The commercial-motor-vehicle definition in 390.5, and the CDL definition in 383.5, both use the rating or the actual weight, whichever is greater. A light rating does not help if the loaded truck weighs more than the threshold; a heavy rating counts even when the truck is empty.

The three lines to remember

  • 10,001 lbs — commercial motor vehicle: USDOT number (interstate), medical card, qualification file, hours rules, inspections.
  • 26,001 lbs — CDL, and with it drug and alcohol testing.
  • Placarded hazardous materials, or passengers (9+ for pay, 16+ otherwise, counting the driver) — a commercial motor vehicle at any weight.

Never leave the state? Your state’s in-state USDOT rule, state by state

Work it out on your own numbers: Do you need a USDOT number, a medical card or a CDL?

RelayPoint, in your trade’s words: Movers · Junk removal & hauling · Roll-off & dumpsters · Landscaping & tree service · Portable sanitation & septic

This is general information, not legal advice, and RelayPoint is not a law firm or a compliance consultant. Sources: the definitions of interstate commerce, intrastate commerce, GVWR, GCWR and commercial motor vehicle in 49 CFR 390.5, and of commercial motor vehicle in 383.5, as published in September 2026. Whether a particular movement is interstate commerce can be a close legal question; for anything borderline, ask the FMCSA or a transportation attorney. State thresholds for in-state operations differ.